Please tell me.

This is an misleading film, even for a low-budget 1965 educational film. At least half the film clips show something other than what they say they're showing. The "early steam engine" of the walking beam type is really an oil well pumpjack. Some picture of 18th century iron are of modern steel I-beams. Some pictures said to be boilers are of liquid storage tanks. The Holt "stationary steam engine" is a gasoline engine. The "atomic power plant" is an oil refinery.

This was put together out of stock clips with someone who had no idea of what they were looking at.